Sign stake



FIG. 1 is a front elevational view of a sign stake showing my new design with a second stake and a sign shown in broken lines for illustrative purposes only;

FIG. 2 is a perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a side elevational view thereof; and

FIG. 5 is a top plan view thereof. 

The ornamental design for a sign stake, as shown and described. 